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Fault Diagnosis of Output Capacitor of Buck Converter in DC Microgrid
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Jiacheng LI1, Lei REN1, Ling QIN1, Shang WU2, Jianjun HE2
Journal of Power Supply | 2026, 24(2) : 333 - 342
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Journal of Power Supply | 2026, 24(2): 333-342
• Fault Diagnosis and Reliability •
Fault Diagnosis of Output Capacitor of Buck Converter in DC Microgrid
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Jiacheng LI1, Lei REN1, Ling QIN1, Shang WU2, Jianjun HE2
Affiliations
  • 1.School of Electrical Engineering, Nantong University, Nantong 226019, China
  • 2.Nantong Ocean Water Conservancy Engineering Co., Ltd., Nantong 226019, China
Published: 2026-02-28 doi: 10.13234/j.issn.2095-2805.2026.2.333
Outline
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Buck converters in DC microgrid are frequently used to transform the DC voltage of high-voltage bus, and the electrolytic capacitor therein is the most vulnerable component. The analysis of capacitance degradation parameters shows that the equivalent series resistance (ESR) is the best health indicator for electrolytic capacitors, and it is of significance for online monitoring the variations in ESR values in real-time. A non-intrusive online ESR monitoring method for the output capacitor of a Buck converter is proposed, which is based on the output voltage. In this method, the AC component of inductive current is fitted by the drive signal, and the real-time online calculation model of ESR is derived by combining the AC component of output voltage. Under this scheme, the additional current sensors and high-precision trigger sampling devices are not required, and the accurate calculation of the output capacitance ESR of the Buck circuit under different working conditions can be achieved only by sampling the output voltage and combining the drive signal of the switch tube. An experimental platform for the ESR monitoring system was built, and experimental verification was also carried out. Experimental results verified the effectiveness of the proposed method.

Degradation of electrolytic capacitor  /  equivalent series resistance (ESR)  /  Buck converter  /  DC microgrid  /  fault diagnosis
李嘉诚, 任磊, 秦岭, 吴尚, 何建军. 直流微电网Buck变换器输出电容的故障诊断. 电源学报, 2026 , 24 (2) : 333 -342 . DOI: 10.13234/j.issn.2095-2805.2026.2.333
Jiacheng LI, Lei REN, Ling QIN, Shang WU, Jianjun HE. Fault Diagnosis of Output Capacitor of Buck Converter in DC Microgrid[J]. Journal of Power Supply, 2026 , 24 (2) : 333 -342 . DOI: 10.13234/j.issn.2095-2805.2026.2.333
Funding
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  • National Natural Science Foundation of China(62273188)
  • Natural Science Foundation of Jiangsu Province(BK20230616)
  • Natural Science Foundation of the Jiangsu Higher Education Institutions(22KJB470025)
  • Social Livelihood Science and Technology Planning General Project of Nantong City(MS12021015)
Appendix
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Year 2026 volume 24 Issue 2
34
2
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Article Info
doi: 10.13234/j.issn.2095-2805.2026.2.333
  • Receive Date：2023-06-26
  • Online Date：2026-10-29
  • Published：2026-02-28
Article Data
Affiliations
History
  • Received：2023-06-26
  • Revised：2023-09-12
  • Accepted：2023-10-03
Funding
National Natural Science Foundation of China(62273188)
Natural Science Foundation of Jiangsu Province(BK20230616)
Natural Science Foundation of the Jiangsu Higher Education Institutions(22KJB470025)
Social Livelihood Science and Technology Planning General Project of Nantong City(MS12021015)
Affiliations
    1.School of Electrical Engineering, Nantong University, Nantong 226019, China
    2.Nantong Ocean Water Conservancy Engineering Co., Ltd., Nantong 226019, China
References
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https://castjournals.cast.org.cn/joweb/dyxb/EN/10.13234/j.issn.2095-2805.2026.2.333
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表12种不同金属材料的力学参数
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Number of
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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